Volume 510, February 2010
|Number of page(s)||5|
|Section||Celestial mechanics and astrometry|
|Published online||29 January 2010|
Optical counterpart positions of extragalactic radio sources and connecting optical and radio reference frames*,**
TÜBİTAK National Observatory, 07058 Antalya, Turkey e-mail: firstname.lastname@example.org
2 Kazan State University, Kremlevskaya 18, Kazan, 420008, Russia e-mail: Rustem.Gumerov@ksu.ru
3 Shanghai Astronomical Observatory, Nandan Road 80, Shanghai, 200030, PR China e-mail: email@example.com
4 Nikolaev Astronomical Observatory, Observatorna 1, Nikolaev, 54030, Ukraine e-mail: firstname.lastname@example.org
Accepted: 14 October 2009
We discuss the results of an investigation of astrometric positions of extragalactic radio sources from a list for the International Celestial Reference Frame. About 300 fields around extragalactic radio sources were observed during the years 2000-2003. The observations were performed mainly using two telescopes equipped with CCD cameras at TUG, Turkey (Russian-Turkish Telescope – RTT150) and at YAO (1 m telescope), (Kunming, China). The mean accuracies of the measured positions are 38 mas in right ascension and 35 mas in declination. A comparison between the measured optical positions determined using the UCAC2 catalog and the radio positions from the current ICRF shows that the overall optical-minus- radio offsets are -4 and +15 mas for right ascension and declination, respectively. The formal internal errors of these mean offsets are 4 mas. The results of optical positions with respect to the reference catalogue 2MASS are also given. A search for a relation between optical and radio reference frames indicates that the orientation angles are near zero within their accuracy of about 5 mas. The link accuracy becomes 3 mas when our observations are combined with other studies.
Key words: astrometry / reference systems
Tables 2 and 3 giving the positions are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (18.104.22.168) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/510/A10
© ESO, 2010
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